Hi. Congrats on giving up meat, and I really hope it all goes well for you. Unleashed is a great place for advice and encouragement, so I hope you find it helpful here.
I wrote a thread on vegan nutrition that might clear things up for you.
And if you're worried about iron, good plant sources include:
Broccoli
Asian greens
Almonds
Lentils and other legumes
Silverbeet
Wholegrains
To up your iron levels, make sure you have plenty of vitamin C in your food (which is abundant in most of these sources anyway), and steer clear of tea, coffee, red wine and spinach roughly two hours either side of an iron rich meal.
Good veg nutrition comes with practise, much like good veg cooking. You'll gradually build up a sound knowledge base and before you know it, you'll be schooling your unsupportive family on the numerous health benefits of vegetarian and vegan living.

Good luck. You'll do great.